Watersheds of the United States

Name the primary watersheds of the United States.
The order is based on USGS Hydrologic Unit 2-digit identifiers, which roughly corresponds to North-South, then East-West geographically.
Quiz by GrandMo
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Last updated: August 7, 2017
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First submittedAugust 7, 2017
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Answer
New England
Mid-Atlantic
South Atlantic-Gulf
Great Lakes
Ohio
Tennessee
Upper Mississippi
Lower Mississippi
Souris-Red-Rainy
Answer
Missouri
Arkansas-White-Red
Texas-Gulf
Rio Grande
Upper Colorado
Lower Colorado
Great Basin
Pacific Northwest
California
+1
Level 70
Aug 7, 2017
Confusing
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Level 85
Aug 7, 2017
I agree.
+2
Level 71
Aug 8, 2017
Watersheds are the drainage areas of major river systems in relation to where they outflow. For source information and explanation, see USGS site.